patrio



(No Model.) 2 sheets-sheen 1.

L. PATRI() HUT A13 PURNAGE. No'. 317,005.A l Patented May 5, 1885.

5 l Fvg,

' y 5. ALZ?. D `\(L f l S' 'w f /H/ f WW1 A41 l, /1/ H .W o.\;\ l 4 I J'l e B/ f /g e' s L 7/ vll L' 7/ it .AJH/e954 O/rn/ 'cr/mm fr', A

2 Sheets-Sheet 2.

(No Model.)

L. PATRIC.

AHOT AIR A1-"UMIAGF- Patented May 5, v1885.

ATENT LEVIS PATRIC, OF SPRINGFIELD, OHIO.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 317,005, dated May 5, 1885.

Application tiled May 7, 1883. (No model.)

.To all whom it may concern:

Be it known that I, Lnwis Parme, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Hot-Air Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being' had to the accompanying drawings, and to the letters and gures of reference marked thereon, which form a part of this specication.

My invention relates to certain improvements in hot-air furnaces.

My invention consists in the construction of an open fire-bowLwhereby a more direct heat is transmitted to the pipe which spans said re-bowl and the series of vertical pipes surrounding the latter, all of which receive the cold air from below the drum and conduct it through the same; also in the combination, with the tire-bowl, of a coking-chamber by a peculiar construction of the feed-pipe leading into the same, the coal being retained in the v feed-pipe near the iire-loowl until the smoke,

tar, and gases are first consumed and soot or carbon deposits prevented.

My invention further consists in the manner of connecting the cast-metal pipes formed on the bottom plate with the sheet-metal pipesections which form the extensions Vof the former through the drum.

Two sheets of.drawings accompany this* represents a detail view of the exterior end of the magazine, its cap, and means of adjustment.

A represents the drum of the furnace, B the tire-bowl of the same. the latter.

Although the air-pipes are inclosed in a C is the ash-box below sheet-metal drum, A, it is intended that the whole furnace shall be inclosed with brickwork to prevent the escape of heat, except into the proper channels.

rhe ash-box C, which supports the furnace, is oblong, with its rear end rounded, and it is made of heavy iron, inclosed on all sides and top, except the circular opening for the grate D. This latter is provided with a long shaft, Z, extending from the inner rear wall forward through the front wall over the door h, as seen in Figs. l, 2, and 3.

The lire-bowl B is of peculiar and novel construction, consisting of a thick conic frustum with the smaller end resting upon the top of the ash-box encircling the grate D. A complete circular chamber, e', extends around the top of the bowl, which is cast in the same. There is but asingle outside opening, e, in it, into which the cold air is conducted by the horizontal pipe e, which extends outside the wall usually built around the furnace. The object of this annular chamber, as will be seen by the arrows, lis to conduct the cold air into the top of the nre-bowl, over the burningfuel, through the apertures 6,which open from its inner periphery directly therein. These apertures are small and numerous, extending entirely around the inside` of the bowl.

On one side of the tire-bowl is seen the long curved coking-chamber and feed-pipef. This curves upward and outward from the firebowl, extending to the outside of the furnacewall. It is oval in orosssection, as seen in the view Fig. 10, and has an adjustable doorcover on the end f, which is regulated by the thumb-screw fl to admit a greater or less quantity of air through the pipe f.

To prevent choking thc pipe, it is made with gradually-enlarged diameter from its end to its connection with the bowl B, with which it is cast integral. It is but slightly inclined toward the fire-bowl for the purpose of preventing self-feeding of thefuel.

The base of the drum consist-s of a heavy circular plate cast with holes for the system of pipes which extend into and through it. This plate A', unlike that of any other used in furnaces of this kind, has the lower section (consisting of about one-third) of each of its Vertical pipes a cast integral with the plate, as seen in Fig. l. The upper ends of these IOO cast-pipe sections a are made flaring, to allow the heavy sheet-iron pipe-sections b, which constitute the remaining (upper) two-thirds of the pipe to be driven into them, and also to allow this joint to be self-calking'from the falling (accumnlative) ashes which will collect therein around the male section b. i (See Figs. 1 and 12.) A short inner sleeve, c2, extends down into the pipe-section a', below the fiaring end a2, and covers thejoint, as seen in the view Fig. 12.

This mode of constructing a self-calking joint in a furnace-pipe is an important feature in my invention. The pipes, as seen in the drum, Fig. l, do not extend below the lower plate but a trifle as compared with those seen in my former patent, issued May 5, 1874, to Lewis Patric, hot-air furnaces, No. 150,603, on which this is an improvement in many respects. Extending from one side of the drum to the other, with its ends opening through the bottom plate, A, is seen the arch-pipe a, spanning the top of the hre-bowl B. It has a cylindrical top, a, opening at the crown, about double the diameter of its curved pipe a, and into this opening is driven the inverted conic frustum b of sheet metal. A short inner sleeve, c, is inserted over the joint to insure a smoke-tight connection. The lower end of the frustum b rests upon a shoulder, c', inside the central pipe, a3, ofthe arch-pipe ce, to give it a firm seat. The frustum b, as well as the vertical pipes, all pass through the top head or plate of the drum, and are firmly calked to prevent any escape of smoke or gas. The top plate, d, is slightly arched upward, and held in place by a heavy hoop, d, as seen in Figs. 1 and 12. To carry off the denser gases produced by combustion, the smokepipe d extends down through the top plate, d', about one-third the depth of the drum.

y Owing to the number of pipes extending through and within the drum, there is in connection with the latter a very large extent of heating-surface. The air admitted through the arch-pipe a, which escapes upward, passes through the central pipe, a3, into the frustum b.

The functions of the frustum which is shown in my former patent, before mentioned, being sufficiently described therein, it is unnecessary to mention them here. The difference, however, in the conduits which lead to it in this application from the other is obvious. Instead of the horizontal pipes extending to it from the vertical flues, as in the former patent, I use the arch-pipe a, as being a better form of conductor, as bringing the induction end of the frustum nearer to the top of the fire-bowl, and therefore generating more heat 'in the air passing through it in a given time. It also receives the cold air directly through the base-plate A', instead of indirectly through the connection with the vertical pipes, as in the former patent,before mentioned, and therefore obviates the necessity of cutting openings in said vertical pipes to make connections therewith. It also gives a much rmer seat for the frustum, and makes the system 0f connections stronger. An under draft can be had through the ash-box C by means of the upright cyma-reversa pipe E. (Seen in Figs. 1, 2, and 3, and in the detail Fig. 6.) This pipe stands upon the ash-box a little to one side of the feed-pipef, opening into the former. Its upper end is provided with a pendant-shaped valve, j, the stem j of which is connected by a wire or cord with the apartment over the furnace. This cord may extend over a pulley, or other means may be used to raise and lower the valve and to regulate the same. Vhen it is desired to close up the furnace and lessen the supply of air below, this valve can be let down into its sea-t, and when necessary to start the fire it can be raised.

In operating my furnace, the coking-chamber f is filled through` the door f with coal, and a sufficient quantity is pushed into the fire-bowl to charge it, after which the cokingchamber is kept filled, so that the heat of the fuel burning in the bowl B will gradually coke that which is nearest it in the magazine, and the admission of air through the apertures over the latter facilitates burning the gas, smoke, and tar from it, and better prepares it for being used in the fire-bowl. By this means I obtain all the heat from the combustion of the volatile portions' of the coal'irst, and prevent the formation and deposit of soot or carbon; and by producing a draft through the coking-chamber I throw the dame away from the body of fuel therein toward the opposite side of the fire-bowl, thus freeing the mass of coal which is being coked from the flame and smoke emitted therefrom, andcon suming the latter before it ascends within the drum.

I claimas my invention- 1. In a hot-air furnace, the combination ot` an open frustum-shaped fire-bowl, a curved feed-pipe, and magazine slightly inclined toward the latter to prevent self-feeding of the fuel, said magazine being provided with a cap and means for adjusting the same, substantially as set forth.

2. In a hot-air furnace, the combination of an open frustum-shaped fire-bowl, a curved feed-pipe and magazineleading therein, slightly inclined toward said fire-bowl and provided with a cap and means for adjusting the same, said lire-bowl being formed with an annular recess in its top end, with an inlet-pipe, and interior apertures opening over the mouth of said magazine, substantially as and for the purpose set forth.

3. In a hot-air furnace, an open frustumshaped re bowl, in combination with an arched pipe spanning the latter, a crown-pipe connecting said arched pipe centrally over said fire-bowl, with interior shoulders, an inverted conic frustum resting on the latter, a series of cold-air pipes surrounding said inverted conic frustum, and a shell `inclosing IOO IIO

the whole, said inverted conic frustum deflecting the heat from the fire-bowl toward said cold-air pipes, substantially as set forth.

4. In a hot-air furnace, the combination, with magazine f, having the projecting iange at the exterior end of the saine, of thehinged cap or door f and the thumb-screw f2, the latter engaging said ange, substantially as and for the purpose set forth.

5. In a hot-air furnace with interior air-pipes exposed on their outer surface to the heat of the saline and to the products of combustion, aself-lling joint connecting the sections of cast and sheet metal pipe, said joint consisting of the flared end of the cast-metal section, an inner sleeve, of sheet metal, driven therein to make the joint gas-tight, and a` sheetmetal pipe extending over said sheetmetal sleeve, the annular cavity around the latter 2o being filled by the ashes escaping from the fire-bowl.

der, c', and frusturn b, the latter being supported at the lower end by said crown-pipe and archedpipe, and resting upon said inner shoulder, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

LEWIS PATRIC.

Witnesses:

B. C. CONVERSE, E. F. HLL. 

